postinstall.js

// This script change webpack-configs for "ng serve"
const fs = require('fs');
const f_angular = 'node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js';
const { getConfigs } = require('./postinstall.config');

getConfigs()
    .then(({electronConfig}) => {

        fs.readFile(f_angular, 'utf8', function (err, data) {

            if (err) {
                return console.log(err);
            }

            var result = data.replace(/return {([\s\S]+)}[\s]+,/, 'return {');
            var result = result.replace(/target: "web",/g, '');
            var result = result.replace(/return \{/g, 'return {' + electronConfig);

            fs.writeFile(f_angular, result, 'utf8', function (err) {
                if (err) return console.log(err);
            });
        });
    });